a) The first dual graph will have D connected to A, B and C. C connected to A and B. B connected to A as edges. Hence the dual graph will be using atleast 4 colors
b) In this case, E will be connected to C, F will be connected to D.
B is connected to both D and C
A is connected to B
Hence the number of colors needed will be equal to 2
Note - Post any doubts/queries in comments section.
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